You will gain more health benefits because your training the muscles to be under stress.
Accidents are unfortunate events that happened unintentionally, while risky behaviors usually intentional even though the negative effects are already known.
One example of accidents is if plane passengers died during the plane crash. And the example of a risky behavior is to use tobacco product despite the negative effects it has on health.
Answer:
The 3 functions are transport, protection, and regulation:)